Window Replacement Calculator
Estimate the full cost of replacing windows in your home including frames, glazing, scaffolding and building control. UK prices for uPVC, timber, aluminium and composite windows.
How We Calculate This
This calculator estimates the total cost of window replacement including supply, installation, scaffolding and building control fees.
The formula
Total = (Windows × Price each) + Scaffolding + Disposal + Building control
- Price varies by style, material and glazing type
- Scaffolding typically \u00A3800 if upper floors need access
- FENSA/CERTASS registration avoids separate building control fees
Frequently Asked Questions
Related Calculators
Window U-Value Calculator
Calculate window U-value from glass, frame and spacer thermal performance.
Double Glazing Unit Calculator
Calculate DGU thickness, weight per m² and thermal performance by gas fill.
Window Condensation Risk Calculator
Calculate window condensation risk from internal temperature, RH and dew point.
Sealant and Mastic Calculator
Calculate sealant cartridges from joint volume per window frame.
FENSA Registration Calculator
Calculate FENSA registration fees vs building control route for window installations.
Window Energy Savings Calculator
Calculate energy and cost savings from upgrading windows.
Last updated: March 2026
All calculations are estimates. Verify with your supplier.